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This is a copy of the post in the For Sale section of this forum. Form a guy known as Sundance.
I first tried Certan form Bee Works and I can say spray your comb and never worry about Wax moths again . Sundance sells the powdered form which if kept sealed will last for years and is a lot cheaper than the liquid form that Bee Works sells
The stuff really works as advertised. The bees jump into it faster than stored comb treated with wax moth crystals.

This is a powdered form of Bt aizawai which
is the same as Certan/B401. It only takes 4
teaspoons to make a gallon of spray and
there is an indefinite shelf life on this
form prior to mixing. In short, 1/2 pound of
powder will make 32 gallons of spray or more!

Cost is:

$15.00 for 1/4#

$25.00 for 1/2#

$38.50 for 1#

Quantities less than 1# are in zip
locks with lot # and a copy of the insert.
The 1# and 1/2# price includes shipping to USA.
1/4# is shipped first class postage.

Payment can be check or PayPal. PM me with
your PayPal ID and I will send you an invoice.
Please include your shipping address in the
PM. No charges will be made until the day
the Xentari is shipped.Checks may be held
until cleared, money order, or PayPal
ensures immediate shipping.

Disclaimer.... I am not suggesting that you use this product in any other way than what it is labeled for. Follow label instructions provided.

The Busy Bee teaches two lessons: One is not to be idle and the other is not to get stung.

The toxic crystal Bt protein in commercial formulations is only effective when eaten by insects with a specific (usually alkaline) gut pH and the specific gut membrane structures required to bind the toxin. Not only must the insect have the correct physiology and be at a susceptible stage of development, but the bacterium must be eaten in sufficient quantity. When ingested by a susceptible insect, the protein toxin damages the gut lining, leading to gut paralysis. Affected insects stop feeding and die from the combined effects of starvation and tissue damage. Bt spores do not usually spread to other insects or cause disease outbreaks on their own as occurs with many pathogens.

All moth repellants are not the same

Mothballs and Paramoth are not the same. You can buy the paramoth crystals at WalMart for a few dollars.

You might want to think about the long-term proposition of using the crystals. The residue gets into the wax, you have to keep storing your equipment each year with a new supply of crystals, not to mention the smell. With the bt treatment, use of this substance is approved by the organic folks, and it's a one time treatment for the life of the comb. It doesn't smell either.

I dont use neither. But if I was I would use paramoth before I use moth balls. IMO Put the frames in the deep freeze for 24 hours it will kill off the wax moth eggs and larva. By the time you send payment and wait for it to arrive the Wax moths will wreck your comb.